One advantage that Google+ has over Facebook is the fact that if you 
post a hyperlink to a article or website, it could be shared and viewed globally, or during the entire Google+ world enabling you to target specific messages 
to specific audiences. If you desire your article to become on-page one of 16,500,000, "make money online" isn't the best keyword to use.
Other search engines like google sprang up like mushrooms nevertheless it wasn't well before Google were built 
with a stranglehold on the web, setting itself up via powerful algorithms because arbiter of website quality and importance.